/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.persistence.datacache;
import javax.persistence.EntityManager;
import javax.persistence.LockModeType;
import org.apache.openjpa.persistence.EntityManagerImpl;
import org.apache.openjpa.persistence.EntityNotFoundException;
import org.apache.openjpa.persistence.OpenJPAEntityManagerFactorySPI;
import org.apache.openjpa.persistence.OpenJPAEntityManagerSPI;
import org.apache.openjpa.persistence.StoreCache;
import org.apache.openjpa.persistence.StoreCacheImpl;
import org.apache.openjpa.persistence.querycache.common.apps.BidirectionalOne2OneOwned;
import org.apache.openjpa.persistence.querycache.common.apps.BidirectionalOne2OneOwner;
import org.apache.openjpa.persistence.common.utils.AbstractTestCase;
import org.apache.openjpa.persistence.datacache.common.apps.PObject;
/**
* Tests various application behavior with or without DataCache.
* Ideally, an application should behave identically irrespective of the
* DataCache. However, purpose of this test is to identify specific scenarios
* where this ideal is violated. The test case also demonstrates, wherever
* possible, what extra step an application may take to ensure that its
* behavior with or without DataCache remains identical.
*
* So far following use cases are found to demonstrate behavioral differences:
* 1. Inconsistent bidirectional relation
* 2. Refresh
*
* @author Pinaki Poddar
*
*/
public class TestDataCacheBehavesIdentical extends AbstractTestCase {
private static OpenJPAEntityManagerFactorySPI emfWithDataCache;
private static OpenJPAEntityManagerFactorySPI emfWithoutDataCache;
private static final boolean WITH_DATACACHE = true;
private static final boolean CONSISTENT = true;
private static final boolean DIRTY = true;
private static final boolean REFRESH_FROM_DATACACHE = true;
private static final LockModeType NOLOCK = null;
private static final Class<?> ENTITY_NOT_FOUND_ERROR = EntityNotFoundException.class;
private static final Class<?> NO_ERROR = null;
private static final String MARKER_DATACACHE = "in DataCache";
private static final String MARKER_DATABASE = "in Database";
private static final String MARKER_CACHE = "in Object Cache";
private static final String MARKER_DIRTY_CACHE = "in Object Cache (dirty)";
private static long ID_COUNTER = System.currentTimeMillis();
/**
* Sets up two EntityManagerFactory: one with DataCache another without.
*/
public void setUp() throws Exception {
super.setUp();
if (emfWithDataCache == null) {
emfWithDataCache = createEMF(
"openjpa.jdbc.SynchronizeMappings", "buildSchema",
"openjpa.RuntimeUnenhancedClasses", "unsupported",
"openjpa.DataCache", "true",
"openjpa.RemoteCommitProvider", "sjvm",
"openjpa.jdbc.UpdateManager", "constraint",
PObject.class,
BidirectionalOne2OneOwner.class,
BidirectionalOne2OneOwned.class, CLEAR_TABLES);
emfWithoutDataCache = createEMF(
"openjpa.RuntimeUnenhancedClasses", "unsupported",
"openjpa.DataCache", "false",
"openjpa.jdbc.UpdateManager", "constraint",
PObject.class,
BidirectionalOne2OneOwned.class,
BidirectionalOne2OneOwner.class, CLEAR_TABLES);
assertNotNull(emfWithDataCache);
assertNotNull(emfWithoutDataCache);
// StoreCache is, by design, always non-null
assertNotNull(emfWithDataCache.getStoreCache());
assertNotNull(emfWithoutDataCache.getStoreCache());
// however, following distinguishes whether DataCache is active
assertTrue(isDataCacheActive(emfWithDataCache));
assertFalse(isDataCacheActive(emfWithoutDataCache));
}
}
/**
* Affirms via internal structures if the given factory is configured with
* active DataCache. Because, even when DataCache is configured to be
* false, a no-op StoreCache is instantiated by design.
*/
boolean isDataCacheActive(OpenJPAEntityManagerFactorySPI emf) {
return ((StoreCacheImpl) emf.getStoreCache()).getDelegate() != null
&& emf.getConfiguration()
.getDataCacheManagerInstance()
.getSystemDataCache() != null;
}
/**
* Create one-to-one bidirectional relation (may or may not be consistent)
* between two pairs of instances. Creates four instances Owner1, Owned1,
* Owner2, Owned2. The first instance has the given id. The id of the other
* instances monotonically increase by 1. The relationship is set either
* consistently or inconsistently. Consistent relation is when Owner1 points
* to Owned1 and Owned1 points back to Owner1. Inconsistent relation is when
* Owner1 points to Owned1 but Owned1 points to Owner2 instead of Owner1.
*
*
* @param em
* the entity manager to persist the instances
* @param id
* the identifier of the first owner instance. The identifier for
* the other instances are sequential in order of creation.
* @param consistent
* if true sets the relationship as consistent.
*/
public void createBidirectionalRelation(EntityManager em, long id,
boolean consistent) {
BidirectionalOne2OneOwner owner1 = new BidirectionalOne2OneOwner();
BidirectionalOne2OneOwned owned1 = new BidirectionalOne2OneOwned();
BidirectionalOne2OneOwner owner2 = new BidirectionalOne2OneOwner();
BidirectionalOne2OneOwned owned2 = new BidirectionalOne2OneOwned();
owner1.setId(id++);
owned1.setId(id++);
owner2.setId(id++);
owned2.setId(id++);
owner1.setName("Owner1");
owned1.setName("Owned1");
owned2.setName("Owned2");
owner2.setName("Owner2");
owner1.setOwned(owned1);
owner2.setOwned(owned2);
if (consistent) {
owned1.setOwner(owner1);
owned2.setOwner(owner2);
} else {
owned1.setOwner(owner2);
owned2.setOwner(owner1);
}
em.getTransaction().begin();
em.persist(owner1);
em.persist(owned1);
em.persist(owner2);
em.persist(owned2);
em.getTransaction().commit();
em.clear();
}
/**
* Verifies that bidirectionally related objects can be persisted
* and later retrieved in a different transaction.
*
* Creates interrelated set of four instances.
* Establish their relation either consistently or inconsistently based
* on the given flag.
* Persist them and then clear the context.
* Fetch the instances in memory again by their identifiers.
* Compare the interrelations between the fetched instances with the
* relations of the original instances (which can be consistent or
* inconsistent).
*
* The mapping specification is such that the bidirectional relation is
* stored in database by a single foreign key. Hence database relation
* is always consistent. Hence the instances retrieved from database are
* always consistently related irrespective of whether they were created
* with consistent or inconsistent relation.
* However, when the instances are retrieved from the data cache, data cache
* will preserve the in-memory relations even when they are inconsistent.
*
* @param useDataCache
* use DataCache
* @param consistent
* assume that the relationship were created as consistent.
*/
public void verifyBidirectionalRelation(boolean useDataCache,
boolean createConsistent, boolean expectConsistent) {
EntityManager em = (useDataCache)
? emfWithDataCache.createEntityManager()
: emfWithoutDataCache.createEntityManager();
long id = ID_COUNTER++;
ID_COUNTER += 4;
createBidirectionalRelation(em, id, createConsistent);
BidirectionalOne2OneOwner owner1 =
em.find(BidirectionalOne2OneOwner.class, id);
BidirectionalOne2OneOwned owned1 =
em.find(BidirectionalOne2OneOwned.class, id + 1);
BidirectionalOne2OneOwner owner2 =
em.find(BidirectionalOne2OneOwner.class, id + 2);
BidirectionalOne2OneOwned owned2 =
em.find(BidirectionalOne2OneOwned.class, id + 3);
assertNotNull(owner1);
assertNotNull(owner2);
assertNotNull(owned1);
assertNotNull(owned2);
assertEquals(owner1, expectConsistent
? owner1.getOwned().getOwner()
: owner2.getOwned().getOwner());
assertEquals(owner2, expectConsistent
? owner2.getOwned().getOwner()
: owner1.getOwned().getOwner());
assertEquals(owned1, owner1.getOwned());
assertEquals(expectConsistent ? owner1 : owner2, owned1.getOwner());
assertEquals(owned2, owner2.getOwned());
assertEquals(expectConsistent ? owner2 : owner1, owned2.getOwner());
}
public void testConsitentBidirectionalRelationIsPreservedWithDataCache() {
verifyBidirectionalRelation(WITH_DATACACHE, CONSISTENT, CONSISTENT);
}
public void testConsitentBidirectionalRelationIsPreservedWithoutDataCache()
{
verifyBidirectionalRelation(!WITH_DATACACHE, CONSISTENT, CONSISTENT);
}
public void testInconsitentBidirectionalRelationIsPreservedWithDataCache() {
verifyBidirectionalRelation(WITH_DATACACHE, !CONSISTENT, !CONSISTENT);
}
public void
testInconsitentBidirectionalRelationIsNotPreservedWithoutDataCache() {
verifyBidirectionalRelation(!WITH_DATACACHE, !CONSISTENT, CONSISTENT);
}
/**
* Verify that refresh() may fetch state from either the data cache or the
* database based on different conditions.
* The conditions that impact are
* a) whether current lock is stronger than NONE
* b) whether the instance being refreshed is dirty
*
* An instance is created with data cache marker and persisted.
* A native SQL is used to update the database record with database marker.
* The in-memory instance is not aware of this out-of-band update.
* Then the in-memory instance is refreshed. The marker of the refreshed
* instance tells whether the instance is refreshed from the data cache
* of the database.
*
* @param useDataCache flags if data cache is active. if not, then surely
* refresh always fetch state from the database.
*
* @param datacache the marker for the copy of the data cached instance
* @param database the marker for the database record
* @param lock lock to be used
* @param makeDirtyBeforeRefresh flags if the instance be dirtied before
* refresh()
* @param expected The expected marker i.e. where the state is refreshed
* from. This should be always <code>MARKER_DATABASE</code>.
* a) whether DataCache is active
* b) whether current Lock is stronger than NOLOCK
* c) whether the object to be refreshed is dirty
*
* The following truth table enumerates the possibilities
*
* Use Cache? Lock? Dirty? Target
* Y Y Y Database
* Y N Y Data Cache
* Y Y N Data Cache
* Y N N Data Cache
*
* N Y Y Database
* N N Y Database
* N Y N Object Cache
* N N N Object Cache
*/
public void verifyRefresh(boolean useDataCache, LockModeType lock,
boolean makeDirtyBeforeRefresh, boolean refreshFromDataCache,
String expected) {
OpenJPAEntityManagerFactorySPI emf = (useDataCache)
? emfWithDataCache : emfWithoutDataCache;
emf.getConfiguration().setRefreshFromDataCache(refreshFromDataCache);
OpenJPAEntityManagerSPI em = emf.createEntityManager();
em.getTransaction().begin();
PObject pc = new PObject();
pc.setName(useDataCache ? MARKER_DATACACHE : MARKER_CACHE);
em.persist(pc);
em.getTransaction().commit();
Object oid = pc.getId();
StoreCache dataCache = emf.getStoreCache();
assertEquals(useDataCache, dataCache.contains(PObject.class, oid));
// Modify the record in the database in a separate transaction using
// native SQL so that the in-memory instance is not altered
em.getTransaction().begin();
String sql = "UPDATE L2_PObject SET NAME='" + MARKER_DATABASE
+ "' WHERE id=" + oid;
em.createNativeQuery(sql).executeUpdate();
em.getTransaction().commit();
assertEquals(useDataCache ? MARKER_DATACACHE : MARKER_CACHE,
pc.getName());
em.getTransaction().begin();
if (makeDirtyBeforeRefresh) {
pc.setName(MARKER_DIRTY_CACHE);
}
assertEquals(makeDirtyBeforeRefresh, em.isDirty(pc));
if (lock != null) {
((EntityManagerImpl)em).getFetchPlan().setReadLockMode(lock);
}
em.refresh(pc);
assertEquals(expected, pc.getName());
em.getTransaction().commit();
}
/**
* The expected marker i.e. where the state is refreshed from depends on
* a) whether DataCache is active
* b) whether current Lock is stronger than NOLOCK
* c) whether the object to be refreshed is dirty
*
* The following truth table enumerates the possibilities
*
* Use Cache? Lock? Dirty? Target
* Y Y Y Database
* Y N Y Data Cache
* Y Y N Data Cache
* Y N N Data Cache
*
* N Y Y Database
* N N Y Database
* N Y N Object Cache
* N N N Object Cache
*
* @param datacache the marker for
* @param database
* @param useDataCache
* @param lock
* @param makeDirtyBeforeRefresh
* @return
*/
String getExpectedMarker(boolean useDataCache, LockModeType lock,
boolean makeDirtyBeforeRefresh) {
if (useDataCache) {
return (lock != null) ? MARKER_DATABASE : MARKER_DATACACHE;
} else {
return MARKER_DATABASE;
}
}
public void testDirtyRefreshWithNoLockHitsDatabase() {
verifyRefresh(WITH_DATACACHE, NOLOCK, DIRTY, !REFRESH_FROM_DATACACHE,
MARKER_DATABASE);
}
public void testDirtyRefreshWithNoLockHitsDataCache() {
verifyRefresh(WITH_DATACACHE, NOLOCK, DIRTY, REFRESH_FROM_DATACACHE,
MARKER_DATACACHE);
}
public void testCleanRefreshWithNoLockDoesNotHitDatabase() {
verifyRefresh(WITH_DATACACHE, NOLOCK, !DIRTY, !REFRESH_FROM_DATACACHE,
MARKER_DATACACHE);
}
public void testCleanRefreshWithNoLockHitsDataCache() {
verifyRefresh(WITH_DATACACHE, NOLOCK, !DIRTY, REFRESH_FROM_DATACACHE,
MARKER_DATACACHE);
}
public void testDirtyRefreshWithReadLockHitsDatabase() {
verifyRefresh(WITH_DATACACHE, LockModeType.READ, DIRTY,
REFRESH_FROM_DATACACHE, MARKER_DATABASE);
verifyRefresh(WITH_DATACACHE, LockModeType.READ, DIRTY,
!REFRESH_FROM_DATACACHE, MARKER_DATABASE);
}
public void testCleanRefreshWithReadLockDoesNotHitDatabase() {
verifyRefresh(WITH_DATACACHE, LockModeType.READ, !DIRTY,
REFRESH_FROM_DATACACHE, MARKER_DATACACHE);
verifyRefresh(WITH_DATACACHE, LockModeType.READ, !DIRTY,
!REFRESH_FROM_DATACACHE, MARKER_DATACACHE);
}
public void testDirtyRefreshWithWriteLockHitsDatabase() {
verifyRefresh(WITH_DATACACHE, LockModeType.WRITE, DIRTY,
REFRESH_FROM_DATACACHE, MARKER_DATABASE);
verifyRefresh(WITH_DATACACHE, LockModeType.WRITE, DIRTY,
!REFRESH_FROM_DATACACHE, MARKER_DATABASE);
}
public void testCleanRefreshWithWriteLockDoesNotHitDatabase() {
verifyRefresh(WITH_DATACACHE, LockModeType.WRITE, !DIRTY,
REFRESH_FROM_DATACACHE, MARKER_DATACACHE);
verifyRefresh(WITH_DATACACHE, LockModeType.WRITE, !DIRTY,
!REFRESH_FROM_DATACACHE, MARKER_DATACACHE);
}
public void testDirtyRefreshWithoutDataCacheAlwaysHitsDatabase() {
verifyRefresh(!WITH_DATACACHE, NOLOCK, DIRTY, REFRESH_FROM_DATACACHE,
MARKER_DATABASE);
verifyRefresh(!WITH_DATACACHE, LockModeType.READ, DIRTY,
REFRESH_FROM_DATACACHE, MARKER_DATABASE);
verifyRefresh(!WITH_DATACACHE, LockModeType.WRITE, DIRTY,
REFRESH_FROM_DATACACHE, MARKER_DATABASE);
verifyRefresh(!WITH_DATACACHE, NOLOCK, DIRTY, !REFRESH_FROM_DATACACHE,
MARKER_DATABASE);
verifyRefresh(!WITH_DATACACHE, LockModeType.READ, DIRTY,
!REFRESH_FROM_DATACACHE, MARKER_DATABASE);
verifyRefresh(!WITH_DATACACHE, LockModeType.WRITE, DIRTY,
!REFRESH_FROM_DATACACHE, MARKER_DATABASE);
}
public void testCleanRefreshWithoutDataCacheDoesNotHitDatabase() {
verifyRefresh(!WITH_DATACACHE, NOLOCK, !DIRTY, REFRESH_FROM_DATACACHE,
MARKER_CACHE);
verifyRefresh(!WITH_DATACACHE, LockModeType.READ, !DIRTY,
REFRESH_FROM_DATACACHE, MARKER_CACHE);
verifyRefresh(!WITH_DATACACHE, LockModeType.WRITE, !DIRTY,
REFRESH_FROM_DATACACHE, MARKER_CACHE);
verifyRefresh(!WITH_DATACACHE, NOLOCK, !DIRTY, !REFRESH_FROM_DATACACHE,
MARKER_CACHE);
verifyRefresh(!WITH_DATACACHE, LockModeType.READ, !DIRTY,
!REFRESH_FROM_DATACACHE, MARKER_CACHE);
verifyRefresh(!WITH_DATACACHE, LockModeType.WRITE, !DIRTY,
!REFRESH_FROM_DATACACHE, MARKER_CACHE);
}
/**
* Verify behavior of refreshing an instance which has been deleted by
* out-of-band process (e.g. a native SQL in a separate transaction).
* The behavior differs when refresh() without a lock fetches the data from
* DataCache even when the original database record is deleted.
*
* @param useDataCache
* @param lock
*/
public void verifyDeleteDetectionOnRefresh(boolean useDataCache,
boolean dirty, LockModeType lock, Class<?> expectedExceptionType) {
OpenJPAEntityManagerFactorySPI emf = (useDataCache)
? emfWithDataCache : emfWithoutDataCache;
OpenJPAEntityManagerSPI em = emf.createEntityManager();
em.getTransaction().begin();
PObject pc = new PObject();
pc.setName(useDataCache ? MARKER_DATACACHE : MARKER_CACHE);
em.persist(pc);
em.getTransaction().commit();
Object oid = pc.getId();
StoreCache dataCache = emf.getStoreCache();
assertEquals(useDataCache, dataCache.contains(PObject.class, oid));
// delete the record in the database in a separate transaction using
// native SQL so that the in-memory instance is not altered
em.getTransaction().begin();
String sql = "DELETE FROM L2_PObject WHERE id="+oid;
em.createNativeQuery(sql).executeUpdate();
em.getTransaction().commit();
// the object cache does not know that the record was deleted
assertTrue(em.contains(pc));
// nor does the data cache
assertEquals(useDataCache, dataCache.contains(PObject.class, oid));
/**
* refresh behavior no more depends on current lock. Refresh
* will always attempt to fetch the instance from database
* raising EntityNotFoundException.
*
*/
em.getTransaction().begin();
em.getFetchPlan().setReadLockMode(lock);
if (dirty)
pc.setName("Dirty Name");
try {
em.refresh(pc);
if (expectedExceptionType != null) {
fail("expected " + expectedExceptionType.getSimpleName() +
" for PObject:" + oid);
}
} catch (Exception ex) {
boolean expectedException = expectedExceptionType != null &&
expectedExceptionType.isAssignableFrom(ex.getClass());
if (!expectedException) {
ex.printStackTrace();
String error = (expectedExceptionType == null)
? "no exception" : expectedExceptionType.getName();
fail("expected " + error + " for PObject:" + oid);
}
} finally {
em.getTransaction().rollback();
}
}
public void testDeleteIsNotDetectedOnCleanRefreshWithoutLockWithDataCache() {
verifyDeleteDetectionOnRefresh(WITH_DATACACHE, !DIRTY, NOLOCK, NO_ERROR);
}
public void testDeleteIsDetectedOnCleanRefreshWithLockWithDataCache() {
verifyDeleteDetectionOnRefresh(WITH_DATACACHE, !DIRTY, LockModeType.READ, ENTITY_NOT_FOUND_ERROR);
verifyDeleteDetectionOnRefresh(WITH_DATACACHE, !DIRTY, LockModeType.WRITE, ENTITY_NOT_FOUND_ERROR);
}
public void testDeleteIsDetectedOnDirtyRefreshWithoutLockWithDataCache() {
verifyDeleteDetectionOnRefresh(WITH_DATACACHE, DIRTY, NOLOCK, ENTITY_NOT_FOUND_ERROR);
}
public void testDeleteIsDetectedOnDirtyRefreshWithLockWithDataCache() {
verifyDeleteDetectionOnRefresh(WITH_DATACACHE, DIRTY, LockModeType.READ, ENTITY_NOT_FOUND_ERROR);
verifyDeleteDetectionOnRefresh(WITH_DATACACHE, DIRTY, LockModeType.WRITE, ENTITY_NOT_FOUND_ERROR);
}
public void testDeleteIsDetectedOnDirtyRefreshWitDataCache() {
verifyDeleteDetectionOnRefresh(WITH_DATACACHE, DIRTY, LockModeType.READ, ENTITY_NOT_FOUND_ERROR);
verifyDeleteDetectionOnRefresh(WITH_DATACACHE, DIRTY, LockModeType.WRITE, ENTITY_NOT_FOUND_ERROR);
}
public void testDeleteIsDetectedOnCleanRefreshWithoutLockWithoutDataCache() {
verifyDeleteDetectionOnRefresh(!WITH_DATACACHE, !DIRTY, NOLOCK, ENTITY_NOT_FOUND_ERROR);
}
public void testDeleteIsDetectedOnCleanRefreshWithLockWithoutDataCache() {
verifyDeleteDetectionOnRefresh(!WITH_DATACACHE, !DIRTY, LockModeType.READ, ENTITY_NOT_FOUND_ERROR);
verifyDeleteDetectionOnRefresh(!WITH_DATACACHE, !DIRTY, LockModeType.WRITE, ENTITY_NOT_FOUND_ERROR);
}
}